Kalapüügil ja veetaimede kogumisel tuleb säilitada nende varude taastumisvõime ja veekogude tootlikkus ning vältida ebasoovitavaid muutusi veekogude ökosüsteemis.
The United Kingdom contends that the measure adopted is a genuine conservation measure since fishing for Norway pout with small-mesh nets results in large by-catches of juvenile haddock and whiting , reducing subsequent catches of those fish when mature for human consumption whilst prejudicing the reproduction capacity of the stocks.